... 4,MOQ;1000pieces High Quality SWT Piezoelectric Diaphragm for External Drive Main feature of Piezo Ceramic Element:-Extremely ... (Piezoceramics element; Piezo diaphragm, piezo plate)1, For sound making:Clocks,Calculators,Telephones,Washing machines,Various(Burglar ... & Attributive Characters:1, Electrode form/ Modulating: External drive (diode); Self drive (transistor);2, Thickness: Thick (T>0.5mm); ...